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John Salvati's avatar

Excellent piece, as always, and not to deflect from your critical main point, but regarding life beyond us, here is anther thought, "Our universe is described by physical laws that contain numerical values, which, in technical language, are called “fundamental universal constants.” You could say that the laws in a mathematical formulation are the grammar of the universe, while the constants – the numerical values – are the concrete words used by the universe to “disclose itself.”

You may therefore wonder what would happen if the physical laws, or constants, were different. Would life still be possible? And therefore, why does the universe seem to be fine-tuned, so precisely tuned, to allow the birth of complex and sentient living beings?

Cosmologists normally build enormous and complex simulation programs in order to study possible universes with different natural laws, developing in this way the game of “What would happen if…?” What would happen if the constant of gravitational acceleration were modified? What would be the consequences of a change of electron mass? What would happen if there were a different strong nuclear interaction, changing the one that keeps together protons and neutrons (the nuclei of atoms)? What if there were a change in the masses of quarks (that is, the elements that form the protons and neutrons, and are at the base of the atomic nuclei)? Cosmologists ask these questions in an increasingly radical way, even asking themselves what would be the consequences if the free parameters of the physical models, the different fundamental forces, the second law of thermodynamics, and even the number of spatial dimensions were changed.

These studies and their conclusions, although impossible to observe experimentally, represent established facts that are generally shared by the scientific community. And it can be said that hypothetical universes with even slightly modified laws of nature would not be inhabitable by humans"--Paolo Beltrami, "A Lucky Universe?"

Could it be that we are simply unique, existing under unique circumstances?

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Dawn's avatar

As an amateur astronomer, I'd like to point out that the universe could be (and possibly is) teeming with life. Space is vast beyond understanding. One light year is 6 trillion miles. Not billion, trillion. That means light, the fastest possible thing, takes four years to get to the nearest star. There are a billion trillion galaxies that we know of, each with billions of stars just as far from each other as we are from the 100 billion stars (all farther than 4 light years) in our medium sized galaxy. Yes we are special. No, we are unlikely to be alone. No they can't reach us and other life is just as far biologically from us as we are from a tree, or a mushroom. Life needs certain elements and compounds. Turns out, they are everywhere. Add the immense span of time - 13 billion years, and the universe is full of life we can only dream about. Live long and prosper.

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